Can you believe it? In May 2015, YouTube turned 10 years old! What did we do before all those cat videos to keep ourselves entertained?! To celebrate this milestone, here are 10 facts you never knew about the video sharing site, including their most popular ever videos...

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1. The site seemed to be off to a slow start with this first video, a slightly snoozy clip of YouTube co-founder Jawed Karim on a day trip to the zoo. It was uploaded in April 2005, before the site was even made public. Did he know then that big things beckoned?

2. Since 2005, YouTube has become the third most-visited website, ranking only behind Google and Facebook.

3. Eh, sexy lady… The most watched video is Psy’s Gangnam Style, which has accumilated a whopping two billion, three hundred thirty-nine million, twenty thousand views – and counting!

4. YouTube has a billion regular users, that’s one in seven people worldwide! If YouTube were a country, it’d be the third largest in the world after China and India.

5. Remember these two cuties? The most popular non-music video on YouTube is Charlie Bit My Finger, starring two British brothers, Harry and Charlie Davies-Carr. It was uploaded in 2007 and has had over 816 million views!

6. Over 300 hours of video to the site, every single minute!

7. Meet 24-year-old Zoe Sugg, AKA Zoella, a British YouTube vlogger whose videos bring in an estimated annual income of £300,000! Since she began uploading video blogs in 2009, she’s become a bonefide celeb who has racked up over 6.8 million subscribers, has written her first novel, and appeared on the Band Aid 30 single.

PA Photos

PA Photos

8. Now Justin Bieber is a troubled teen idol, worth over $80m. Back in 2007 he was a unknown Canadian lad singing songs in his house. How was he discovered… YouTube of course!

9. It’s not just Zoella and Justin who are coining it in thanks to YouTube. In fact it’s not even just humans who can make a fast buck on the site. One year after sour puss, Tardar Sauce, AKA Grumpy Cat’s first video, which scored over 16 million views, she’d been offered the role of spokescat for a popular brand of cat food. Three years on, she’s had a two-book deal, a feature film, a product range and is said to be worth a mind-blowing $100m! Here she is, proving that money you can’t buy happiness…

10. Rumour has it, the site that became YouTube was originally going to be a video dating site with the name Tune In and Hook Up. Then the developers took a different route and thank God they did… Here’s to 10 more years of funny cats and daft songs!